Question

I have a comma separated list of values, and I need to remove the one that is equal to a certain value.

myList = '10,20,30';
myList.remove(20); // === '10,30'

Answer 1

Here is some tested and jslinted code that does what you’re asking for.

if (!String.prototype.removeListItem) {
   String.prototype.removeListItem = function(value, delimiter) {
      delimiter = delimiter || ',';
      value = value.toString();
      var arr = this.split(delimiter),
         index = arr.indexOf(value);
      while (index >= 0) {
         arr.splice(index, 1);
         index = arr.indexOf(value);
      }
      return arr.join(delimiter);
   };
}

alert('10,20,30,120,200'.removeListItem(20));
// yields '10,30,120,200'

However, I question why you would do this. Arrays should be stored in array objects, not in string literals. If you need to display the list, then convert to a delimited list at display time. If your input is a string, then split it at input time and keep it internally as an array. I really strongly believe this is the best practice for you and in the long run you will have much easier to maintain code that is much easier to understand.